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From: Alexandre DERUMIER <aderumier@odiso.com>
To: qemu-devel <qemu-devel@nongnu.org>
Subject: [Qemu-devel] qmp drive-mirror vs qemu-img convert , drive-mirror really slow
Date: Mon, 21 Jan 2013 10:40:26 +0100 (CET)	[thread overview]
Message-ID: <f670b76a-5103-4675-b9cc-2db8c51744ec@mailpro> (raw)
In-Reply-To: <fdc4edd8-3194-4621-a58c-bfee5e5e9826@mailpro>

Hi list,

I'm doing some speed benchmark between

drive-mirror vs qemu-img convert ,

and drive-mirror seem to be a lot slower.


test:

convert 1 32GB qcow2 file to raw file, local storage (6 disk 15k in raid10 + raid BBU cache)

time result:

qemu-img : 30sec
drive-mirror (vm is paused, no writes) : 5min


Any idea why drive-mirror is so slow ? (maybe does it use directsync when mirroring ?)

I think both should have around same speed ?


Best Regards,

Derumier Alexandre

       reply	other threads:[~2013-01-21  9:41 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <fdc4edd8-3194-4621-a58c-bfee5e5e9826@mailpro>
2013-01-21  9:40 ` Alexandre DERUMIER [this message]
2013-01-21 10:35   ` [Qemu-devel] qmp drive-mirror vs qemu-img convert , drive-mirror really slow Paolo Bonzini
2013-01-21 10:45     ` Alexandre DERUMIER

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